Question: Who was the sibling of Silvio Berlusconi?
Paraphrase: Who was Silvio Berlusconi's sister?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P3373 wd:Q11860 . ?sbj wdt:P31 wd:Q5 } 
Answer: Paolo Berlusconi, Maria Antonietta Berlusconi